20181CSE0068 , Sql Server

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create table employee(ssn int primary key, name varchar(20) not null, address varchar(20), salary int, sex varchar(10));
create table department(dno int primary key, dname varchar(10),mgrssn int);
create table project(pno int primary key, pname varchar(10),ploctation varchar(20),dno int, foreign key (dno) references department(dno) on delete cascade) ;
create table Workson(ssn int, pno int, hours int, foreign key (ssn) references employee(ssn) on delete cascade, foreign key(pno) references project(pno) on delete cascade) ;
insert into employee values (1,'nithesh', 'Banglore', 10000,'male');
select *from employee;
insert into employee values(2,'krishna', 'hyderabad', 15000,'male');
insert into employee values(3,'hari','pune',20000,'male');
insert into employee values (4,'sam','delhi',30000,'female');
insert into employee values(5,'nikita', 'mumbai', 40000,'female') ;
select *from employee;
insert into department values (1,'research', 123) ;
select *from department ;
insert into department values(2,'mining', 345);
insert into department values (3,'construction', 567);
insert into department values (4,'medical', 678);
insert into department values (5,'teaching', 789);
select *from department;
insert into project values(101,'roads', 'bangalore',

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